GROZ Smoothing Bench Planer (SP-4)Engineered to exacting tolerances while maintaining traditional standards of workmanship, design and performance Robust gray cast iron bases which are accurately machined and ground to high precision Sole is flat to 0. 075 mm Spring steel cutter blade is hardened to 55 to 5 HRC and hones quickly to a razor sharp, long lasting edge Accurately machined blade seating eliminates blade chatter Fully adjustable frog provides the required setting for the